On Application Start function?

I need something to happen not on Start/Awake, and not when a scene is loaded, but only once the application is launched. It means that if I reload the scene, the function WILL NOT be called. PlayerPrefs doesn't work here too, because I DO want the function to be called again the next time the player launches the app. Is this possible?

 

What I do is have a boot scene, which has what I want to stay persistent, and use DontDestroyOnLoad on the objects in the scene in the awake function, then I load the next scene which might be the menu or whatever. Don't know if that's what you mean or not. There is a video on persistence in the learn tutorials.

 

Yeah, this is definitely the winner way on Unity. Every one of my games has a "zeroscene" and it handles all the "I only want this to happen once" stuff.

Alternately if you don't want to be reliant on going to a zeroscene every time you press play, you can implement one of the various ways of making Unity Singletons. Here's some more info on those:

http://wiki.unity3d.com/index.php/Singleton

 

MY starter scene is called "Init". I think a lot of developers use those

It loads manager stuff, forwards to a menu scene or primary scene, and is never seen again until the app is launched again.

 

Doing an init/boot/zero scene that won't be seen again, sounds like a great idea.
This is exactly what I need.
Thank you guys!

 

Also if you want quick boot up, you can create a small temporary script, where you show a selector to select a level and upon start after the boot you can load that scene directly. So you keep the good things from both worlds, boot scene and "direct" play in a specific scene.

 

Thank you! works like a charm.

 

you could just say in void Update
if(Time.time == 0f)
Debug.Log("!");

will be called once the game has started even if you are making the class [ExecuteAlways]

because Time.time will not be zero in edit mode, but will be 0 on game start

 

That's a fantastic way to introduce a nearly untraceable bug. If you must rely on an approach like that you should use a variable that you have full control of and not one that will be modified outside of the script that depends on an arbitrary value. Time.time is not guaranteed to be 0 in Update() on the first frame.

Code (csharp):

1. bool isGameStarted = false;
2.  
3. void Update()
4. {
5.     if (!isGameStarted)
6.     {
7.         isGameStarted = true;
8.  
9.         // do stuff
10.     }
11. }